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x86, cacheinfo: Calculate L3 indices 

We need to know the valid L3 indices interval when disabling them over
/sysfs. Do that when the core is brought online and add boundary checks
to the sysfs .store attribute.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
LKML-Reference: <1264172467-25155-6-git-send-email-bp@amd64.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Borislav Petkov 2010-01-22 16:01:07 +01:00 committed by H. Peter Anvin
parent 897de50e08
commit 048a8774ca
1 changed files with 31 additions and 4 deletions
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35
arch/x86/kernel/cpu/intel_cacheinfo.c
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@ -151,7 +151,8 @@ struct _cpuid4_info {
union _cpuid4_leaf_ebx ebx;
union _cpuid4_leaf_ecx ecx;
unsigned long size;
unsigned long can_disable;
bool can_disable;
unsigned int l3_indices;
DECLARE_BITMAP(shared_cpu_map, NR_CPUS);
};
@ -161,7 +162,8 @@ struct _cpuid4_info_regs {
union _cpuid4_leaf_ebx ebx;
union _cpuid4_leaf_ecx ecx;
unsigned long size;
unsigned long can_disable;
bool can_disable;
unsigned int l3_indices;
};
unsigned short num_cache_leaves;
@ -291,6 +293,29 @@ amd_cpuid4(int leaf, union _cpuid4_leaf_eax *eax,
(ebx->split.ways_of_associativity + 1) - 1;
}
static unsigned int __cpuinit amd_calc_l3_indices(void)
{
/*
* We're called over smp_call_function_single() and therefore
* are on the correct cpu.
*/
int cpu = smp_processor_id();
int node = cpu_to_node(cpu);
struct pci_dev *dev = node_to_k8_nb_misc(node);
unsigned int sc0, sc1, sc2, sc3;
u32 val;
pci_read_config_dword(dev, 0x1C4, &val);
/* calculate subcache sizes */
sc0 = !(val & BIT(0));
sc1 = !(val & BIT(4));
sc2 = !(val & BIT(8)) + !(val & BIT(9));
sc3 = !(val & BIT(12)) + !(val & BIT(13));
return (max(max(max(sc0, sc1), sc2), sc3) << 10) - 1;
}
static void __cpuinit
amd_check_l3_disable(int index, struct _cpuid4_info_regs *this_leaf)
{
@ -306,7 +331,8 @@ amd_check_l3_disable(int index, struct _cpuid4_info_regs *this_leaf)
(boot_cpu_data.x86_mask < 0x1)))
return;
this_leaf->can_disable = 1;
this_leaf->can_disable = true;
this_leaf->l3_indices = amd_calc_l3_indices();
}
static int
@ -765,7 +791,8 @@ static ssize_t store_cache_disable(struct _cpuid4_info *this_leaf,
return -EINVAL;
/* do not allow writes outside of allowed bits */
if (val & ~(SUBCACHE_MASK | SUBCACHE_INDEX))
if ((val & ~(SUBCACHE_MASK | SUBCACHE_INDEX)) ||
((val & SUBCACHE_INDEX) > this_leaf->l3_indices))
return -EINVAL;
val |= BIT(30);